Stormwater Management: Folsom vs Isleton
How do stormwater management rules compare between Folsom, CA and Isleton, CA?
Isleton has fewer restrictions than Folsom.
Folsom, CA
Sacramento County
Folsom operates a Municipal Separate Storm Sewer System (MS4) under NPDES permit CAS082597 jointly with Sacramento County. Discharging pollutants — soap, paint, oil, sediment — to storm drains is prohibited. New development must meet Low Impact Development standards.
View full Folsom rules →Isleton, CA
Sacramento County
Isleton operates under a state general NPDES MS4 permit for small communities. Illicit discharges to storm drains, sloughs, and the Sacramento River are prohibited. Construction sites over 1 acre require coverage under the Construction General Permit with a SWPPP.
View full Isleton rules →Key Facts Comparison
| Fact | Folsom | Isleton |
|---|---|---|
| MS4 Permit | NPDES CAS082597 | - |
| Co-permittees | Folsom + Sac County | - |
| LID threshold | 5,000 sq ft impervious | - |
| Construction | SWPPP if ≥1 acre | - |
| Receiving waters | American River/Folsom Lake | - |
| Permit Type | - | State MS4 Phase II |
| Discharge Threshold | - | 1 acre construction |
| Required Plan | - | SWPPP |
| Max Fine | - | 25,000 per day |
| Receiving Water | - | Sacramento River |
Highlighted rows indicate differences between cities.
Folsom FAQ
Can I wash my car in my driveway in Folsom?
Occasional residential car washing is tolerated. Commercial or fleet washing that discharges to the storm drain is prohibited. Best practice: wash on grass or at a commercial car wash where water goes to sanitary sewer.
Who enforces this in Folsom?
Folsom code enforcement at (916) 355-7285 handles most complaints.
Isleton FAQ
Can I drain my pool into the street?
Not if it contains chlorine or cleaning chemicals. Dechlorinate first or discharge to landscaping to avoid an illicit discharge violation.
Do I need a SWPPP for a house remodel?
Only if the disturbed ground area exceeds 1 acre. Most residential projects fall well below that threshold.
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